Garmin GTN 6 series Maintenance Manual - page 37

190-01007-A1

System Maintenance Manual GTN 6XX/7XX Part 23 AML STC

Rev. 6

Page 3-17

3.4.5

GTN Diagnostics Page

The GTN Diagnostics page, shown in Figure 3-17, is accessed from the Configuration Mode Home page 

and is a useful tool for diagnosing issues and troubleshooting problems. Ground checks are also performed 

using the tools on this page. 

Figure 3-17. GTN 6XX and 7XX Diagnostics Pages

ARINC Inputs 

This page displays the ARINC 429 data that is being received over each ARINC 429 port. Each port can be 

chosen for display by touching the Port key and toggling between the input ports. Select a port to display. 

The GTN will then display the label, SSM, Data, and SDI for each ARINC 429 input port. This is useful 

for determining if the expected labels are being received and also for troubleshooting incorrect or swapped 

wiring to the input ports. The data log can be paused by toggling the Pause key. Clear the data log by 

touching Clear Log key.

Serial Inputs

This page displays the serial data that is being received and is useful for determining if the GTN is 

receiving data on each connected port. Select the desired port by touching the Port key and selecting the 

RS-232 channel from the list. The data log can be paused by toggling the Pause key. Clear the data log by 

touching Clear Log.

Discrete Inputs

This page displays the state of each of the discrete input pins on the GTN. This page is useful for 

troubleshooting discrete wiring issues.

Discrete Outputs

This page displays the state of each of the discrete outputs and allows them to be toggled between active 

and inactive. This is useful for ensuring that annunciator and signal outputs are properly connected to 

annunciator lights or other LRUs and that they are receiving the signal.